1 Answer
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Add the specified address as a BCC recipient, and inspect the next input line. The address must have a local part and domain part. The number of BCC addresses that can be added is limited only by the amount of available storage space.

Note 1: the BCC address is added as if it was specified with NOTIFY=NONE. The sender will not be notified when the BCC address is undeliverable, as long as all down-stream software implements RFC 3461.